From: peterz@infradead.org
To: Guenter Roeck <linux@roeck-us.net>
Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, will@kernel.org,
npiggin@gmail.com, elver@google.com, jgross@suse.com,
paulmck@kernel.org, rostedt@goodmis.org, rjw@rjwysocki.net,
joel@joelfernandes.org, svens@linux.ibm.com, tglx@linutronix.de,
ulf.hansson@linaro.org, viresh.kumar@linaro.org,
vincent.guittot@linaro.org
Subject: Re: [PATCH v2 11/11] lockdep,trace: Expose tracepoints
Date: Thu, 3 Sep 2020 17:36:49 +0200 [thread overview]
Message-ID: <20200903153649.GF1362448@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <9ea73cb4-262d-d9ba-beac-e9e013f89d6e@roeck-us.net>
On Thu, Sep 03, 2020 at 08:19:38AM -0700, Guenter Roeck wrote:
> This doesn't compile for me - there is no "name" parameter in __DO_TRACE().
>
> Error log:
> In file included from ./include/linux/rculist.h:11,
> from ./include/linux/pid.h:5,
> from ./include/linux/sched.h:14,
> from ./include/linux/sched/numa_balancing.h:10,
> from ./include/trace/events/sched.h:8,
> from kernel/sched/core.c:10:
> ./include/trace/events/sched.h: In function 'trace_sched_kthread_stop':
> ./include/linux/tracepoint.h:175:26: error: '__tracepoint_name' undeclared
>
> I applied your patch on top of v5.9-rc3-75-gfc3abb53250a. Are you using
> a different branch ?
Argh, I was on tip/master... easy fix though.
---
diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index 7d9c1c0e149c..878bac893e41 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -27,17 +27,20 @@
* SOFTIRQ_MASK: 0x0000ff00
* HARDIRQ_MASK: 0x000f0000
* NMI_MASK: 0x00f00000
+ * RCUIDLE_MASK: 0x01000000
* PREEMPT_NEED_RESCHED: 0x80000000
*/
#define PREEMPT_BITS 8
#define SOFTIRQ_BITS 8
#define HARDIRQ_BITS 4
#define NMI_BITS 4
+#define RCUIDLE_BITS 1
#define PREEMPT_SHIFT 0
#define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS)
#define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
#define NMI_SHIFT (HARDIRQ_SHIFT + HARDIRQ_BITS)
+#define RCUIDLE_SHIFT (NMI_SHIFT + NMI_BITS)
#define __IRQ_MASK(x) ((1UL << (x))-1)
@@ -45,11 +48,13 @@
#define SOFTIRQ_MASK (__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT)
#define HARDIRQ_MASK (__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT)
#define NMI_MASK (__IRQ_MASK(NMI_BITS) << NMI_SHIFT)
+#define RCUIDLE_MASK (__IRQ_MASK(RCUIDLE_BITS) << RCUIDLE_SHIFT)
#define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT)
#define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT)
#define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT)
#define NMI_OFFSET (1UL << NMI_SHIFT)
+#define RCUIDLE_OFFSET (1UL << RCUIDLE_SHIFT)
#define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET)
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 598fec9f9dbf..0469bc1c24fc 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -164,12 +164,18 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
void *__data; \
int __maybe_unused __idx = 0; \
\
- if (!(cond)) \
+ if (!(cond) || (preempt_count() & RCUIDLE_MASK)) \
return; \
\
/* srcu can't be used from NMI */ \
WARN_ON_ONCE(rcuidle && in_nmi()); \
\
+ if (IS_ENABLED(CONFIG_LOCKDEP) && !(rcuidle)) { \
+ rcu_read_lock_sched_notrace(); \
+ rcu_dereference_sched((tp)->funcs); \
+ rcu_read_unlock_sched_notrace(); \
+ } \
+ \
/* keep srcu and sched-rcu usage consistent */ \
preempt_disable_notrace(); \
\
@@ -235,11 +241,6 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
TP_PROTO(data_proto), \
TP_ARGS(data_args), \
TP_CONDITION(cond), 0); \
- if (IS_ENABLED(CONFIG_LOCKDEP) && (cond)) { \
- rcu_read_lock_sched_notrace(); \
- rcu_dereference_sched(__tracepoint_##name.funcs);\
- rcu_read_unlock_sched_notrace(); \
- } \
} \
__DECLARE_TRACE_RCU(name, PARAMS(proto), PARAMS(args), \
PARAMS(cond), PARAMS(data_proto), PARAMS(data_args)) \
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 8ce77d9ac716..ad9fb4f12c63 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -269,6 +269,8 @@ static noinstr void rcu_dynticks_eqs_enter(void)
/* Better not have special action (TLB flush) pending! */
WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) &&
(seq & RCU_DYNTICK_CTRL_MASK));
+
+ __preempt_count_add(RCUIDLE_OFFSET);
}
/*
@@ -281,6 +283,8 @@ static noinstr void rcu_dynticks_eqs_exit(void)
struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
int seq;
+ __preempt_count_sub(RCUIDLE_OFFSET);
+
/*
* CPUs seeing atomic_add_return() must see prior idle sojourns,
* and we also must force ordering with the next RCU read-side
next prev parent reply other threads:[~2020-09-03 15:37 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-21 8:47 [PATCH v2 00/11] TRACE_IRQFLAGS wreckage Peter Zijlstra
2020-08-21 8:47 ` [PATCH v2 01/11] lockdep: Use raw_cpu_*() for per-cpu variables Peter Zijlstra
2020-08-27 1:05 ` Joel Fernandes
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-08-21 8:47 ` [PATCH v2 02/11] cpuidle: Fixup IRQ state Peter Zijlstra
2020-08-21 17:36 ` Rafael J. Wysocki
2020-08-27 1:06 ` Joel Fernandes
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-08-21 8:47 ` [PATCH v2 03/11] sched,idle,rcu: Push rcu_idle deeper into the idle path Peter Zijlstra
2020-08-27 1:18 ` Joel Fernandes
2020-08-27 1:24 ` Joel Fernandes
2020-08-27 7:47 ` peterz
2020-08-27 7:53 ` Thomas Gleixner
2020-08-27 22:30 ` Joel Fernandes
2020-09-02 7:08 ` peterz
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-08-21 8:47 ` [PATCH v2 04/11] cpuidle: Make CPUIDLE_FLAG_TLB_FLUSHED generic Peter Zijlstra
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-08-21 8:47 ` [PATCH v2 05/11] cpuidle: Move trace_cpu_idle() into generic code Peter Zijlstra
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-08-21 8:47 ` [PATCH v2 06/11] x86/entry: Remove unused THUNKs Peter Zijlstra
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-08-21 8:47 ` [PATCH v2 07/11] locking/lockdep: Cleanup Peter Zijlstra
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-08-21 8:47 ` [PATCH v2 08/11] nds32: Implement arch_irqs_disabled() Peter Zijlstra
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-08-21 8:47 ` [PATCH v2 09/11] arm64: " Peter Zijlstra
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-08-21 8:47 ` [PATCH v2 10/11] lockdep: Only trace IRQ edges Peter Zijlstra
2020-08-26 0:47 ` Thomas Gleixner
2020-09-02 4:21 ` Guenter Roeck
2020-09-02 9:09 ` peterz
2020-09-02 9:12 ` peterz
2020-09-02 13:48 ` Guenter Roeck
2020-09-08 14:22 ` peterz
2020-09-08 14:40 ` Guenter Roeck
2020-09-08 15:41 ` [PATCH] sparc64: Fix irqtrace warnings on Ultra-S peterz
2020-08-21 8:47 ` [PATCH v2 11/11] lockdep,trace: Expose tracepoints Peter Zijlstra
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-09-02 3:51 ` [PATCH v2 11/11] " Guenter Roeck
2020-09-02 7:24 ` peterz
2020-09-02 13:21 ` Guenter Roeck
2020-09-02 8:56 ` peterz
2020-09-02 13:57 ` Guenter Roeck
2020-09-03 14:00 ` peterz
2020-09-03 14:13 ` peterz
2020-09-03 15:19 ` Guenter Roeck
2020-09-03 15:36 ` peterz [this message]
2020-09-03 15:54 ` Paul E. McKenney
2020-09-03 18:11 ` Guenter Roeck
2020-08-21 12:58 ` [PATCH v2 00/11] TRACE_IRQFLAGS wreckage peterz
2020-08-26 10:16 ` [PATCH v2 12/11] mips: Implement arch_irqs_disabled() peterz
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200903153649.GF1362448@hirez.programming.kicks-ass.net \
--to=peterz@infradead.org \
--cc=elver@google.com \
--cc=jgross@suse.com \
--cc=joel@joelfernandes.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@roeck-us.net \
--cc=mingo@kernel.org \
--cc=npiggin@gmail.com \
--cc=paulmck@kernel.org \
--cc=rjw@rjwysocki.net \
--cc=rostedt@goodmis.org \
--cc=svens@linux.ibm.com \
--cc=tglx@linutronix.de \
--cc=ulf.hansson@linaro.org \
--cc=vincent.guittot@linaro.org \
--cc=viresh.kumar@linaro.org \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).